let obj ={
    jia:function(a,b){
       if(typeof(a)=="number" && typeof(b)=="number"){
            return a+b
       }else{
            console.log("int num")
       }
        
    },
    jian:function(a,b){
        if(typeof(a)=="number" && typeof(b)=="number"){
            return a-b
       }else{
            console.log("int num")
       }
    },
    cheng:function(a,b){
        if(typeof(a)=="number" && typeof(b)=="number"){
            return a*b
       }else{
            console.log("int num")
       }
    },
    chu:function(a,b){
        if(typeof(a)=="number" && typeof(b)=="number"){
            return a/b
       }else{
            console.log("int num")
       }
    },

}

module.exports.obj= obj;
